Re: [PATCH v9 4/4] drm/i915: Skip modeset for cdclk changes if possible

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Looks good.

Reviewed-by: Clint Taylor <Clinton.A.Taylor@xxxxxxxxx>


On 3/27/19 3:13 AM, Imre Deak wrote:
From: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>

If we have only a single active pipe and the cdclk change only requires
the cd2x divider to be updated bxt+ can do the update with forcing a full
modeset on the pipe. Try to hook that up.

v2:
- Wait for vblank after an optimized CDCLK change.
- Avoid optimization if the pipe needs a modeset (or was disabled).
- Split CDCLK change to a pre/post plane update step.
v3:
- Use correct version of CDCLK state as old state. (Ville)
- Remove unused intel_cdclk_can_skip_modeset()
v4:
- For consistency call intel_set_cdclk_post_plane_update() only during
   modesets (and not fastsets).
v5:
- Remove the logic to update the CD2X divider on-the-fly on ICL, since
   only a divider of 1 is supported there. Clint also noticed that the
   pipe select bits in CDCLK_CTL are oddly defined on ICL, it's not clear
   yet whether that's only an error in the specification.

Signed-off-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
Signed-off-by: Abhay Kumar <abhay.kumar@xxxxxxxxx>
Tested-by: Abhay Kumar <abhay.kumar@xxxxxxxxx>
Signed-off-by: Imre Deak <imre.deak@xxxxxxxxx>
---
  drivers/gpu/drm/i915/i915_drv.h      |   3 +-
  drivers/gpu/drm/i915/intel_cdclk.c   | 135 +++++++++++++++++++++++++++--------
  drivers/gpu/drm/i915/intel_display.c |  42 ++++++++++-
  drivers/gpu/drm/i915/intel_drv.h     |  17 ++++-
  4 files changed, 163 insertions(+), 34 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 78e6bb4a54bf..1cb8d99ba0c3 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -282,7 +282,8 @@ struct drm_i915_display_funcs {
  	void (*get_cdclk)(struct drm_i915_private *dev_priv,
  			  struct intel_cdclk_state *cdclk_state);
  	void (*set_cdclk)(struct drm_i915_private *dev_priv,
-			  const struct intel_cdclk_state *cdclk_state);
+			  const struct intel_cdclk_state *cdclk_state,
+			  enum pipe pipe);
  	int (*get_fifo_size)(struct drm_i915_private *dev_priv,
  			     enum i9xx_plane_id i9xx_plane);
  	int (*compute_pipe_wm)(struct intel_crtc_state *cstate);
diff --git a/drivers/gpu/drm/i915/intel_cdclk.c b/drivers/gpu/drm/i915/intel_cdclk.c
index 2fc443468706..b8cd481f5e33 100644
--- a/drivers/gpu/drm/i915/intel_cdclk.c
+++ b/drivers/gpu/drm/i915/intel_cdclk.c
@@ -517,7 +517,8 @@ static void vlv_program_pfi_credits(struct drm_i915_private *dev_priv)
  }
static void vlv_set_cdclk(struct drm_i915_private *dev_priv,
-			  const struct intel_cdclk_state *cdclk_state)
+			  const struct intel_cdclk_state *cdclk_state,
+			  enum pipe pipe)
  {
  	int cdclk = cdclk_state->cdclk;
  	u32 val, cmd = cdclk_state->voltage_level;
@@ -599,7 +600,8 @@ static void vlv_set_cdclk(struct drm_i915_private *dev_priv,
  }
static void chv_set_cdclk(struct drm_i915_private *dev_priv,
-			  const struct intel_cdclk_state *cdclk_state)
+			  const struct intel_cdclk_state *cdclk_state,
+			  enum pipe pipe)
  {
  	int cdclk = cdclk_state->cdclk;
  	u32 val, cmd = cdclk_state->voltage_level;
@@ -698,7 +700,8 @@ static void bdw_get_cdclk(struct drm_i915_private *dev_priv,
  }
static void bdw_set_cdclk(struct drm_i915_private *dev_priv,
-			  const struct intel_cdclk_state *cdclk_state)
+			  const struct intel_cdclk_state *cdclk_state,
+			  enum pipe pipe)
  {
  	int cdclk = cdclk_state->cdclk;
  	u32 val;
@@ -988,7 +991,8 @@ static void skl_dpll0_disable(struct drm_i915_private *dev_priv)
  }
static void skl_set_cdclk(struct drm_i915_private *dev_priv,
-			  const struct intel_cdclk_state *cdclk_state)
+			  const struct intel_cdclk_state *cdclk_state,
+			  enum pipe pipe)
  {
  	int cdclk = cdclk_state->cdclk;
  	int vco = cdclk_state->vco;
@@ -1159,7 +1163,7 @@ void skl_init_cdclk(struct drm_i915_private *dev_priv)
  	cdclk_state.cdclk = skl_calc_cdclk(0, cdclk_state.vco);
  	cdclk_state.voltage_level = skl_calc_voltage_level(cdclk_state.cdclk);
- skl_set_cdclk(dev_priv, &cdclk_state);
+	skl_set_cdclk(dev_priv, &cdclk_state, INVALID_PIPE);
  }
/**
@@ -1177,7 +1181,7 @@ void skl_uninit_cdclk(struct drm_i915_private *dev_priv)
  	cdclk_state.vco = 0;
  	cdclk_state.voltage_level = skl_calc_voltage_level(cdclk_state.cdclk);
- skl_set_cdclk(dev_priv, &cdclk_state);
+	skl_set_cdclk(dev_priv, &cdclk_state, INVALID_PIPE);
  }
static int bxt_calc_cdclk(int min_cdclk)
@@ -1356,7 +1360,8 @@ static void bxt_de_pll_enable(struct drm_i915_private *dev_priv, int vco)
  }
static void bxt_set_cdclk(struct drm_i915_private *dev_priv,
-			  const struct intel_cdclk_state *cdclk_state)
+			  const struct intel_cdclk_state *cdclk_state,
+			  enum pipe pipe)
  {
  	int cdclk = cdclk_state->cdclk;
  	int vco = cdclk_state->vco;
@@ -1409,11 +1414,10 @@ static void bxt_set_cdclk(struct drm_i915_private *dev_priv,
  		bxt_de_pll_enable(dev_priv, vco);
val = divider | skl_cdclk_decimal(cdclk);
-	/*
-	 * FIXME if only the cd2x divider needs changing, it could be done
-	 * without shutting off the pipe (if only one pipe is active).
-	 */
-	val |= BXT_CDCLK_CD2X_PIPE_NONE;
+	if (pipe == INVALID_PIPE)
+		val |= BXT_CDCLK_CD2X_PIPE_NONE;
+	else
+		val |= BXT_CDCLK_CD2X_PIPE(pipe);
  	/*
  	 * Disable SSA Precharge when CD clock frequency < 500 MHz,
  	 * enable otherwise.
@@ -1422,6 +1426,9 @@ static void bxt_set_cdclk(struct drm_i915_private *dev_priv,
  		val |= BXT_CDCLK_SSA_PRECHARGE_ENABLE;
  	I915_WRITE(CDCLK_CTL, val);
+ if (pipe != INVALID_PIPE)
+		intel_wait_for_vblank(dev_priv, pipe);
+
  	mutex_lock(&dev_priv->pcu_lock);
  	/*
  	 * The timeout isn't specified, the 2ms used here is based on
@@ -1526,7 +1533,7 @@ void bxt_init_cdclk(struct drm_i915_private *dev_priv)
  	}
  	cdclk_state.voltage_level = bxt_calc_voltage_level(cdclk_state.cdclk);
- bxt_set_cdclk(dev_priv, &cdclk_state);
+	bxt_set_cdclk(dev_priv, &cdclk_state, INVALID_PIPE);
  }
/**
@@ -1544,7 +1551,7 @@ void bxt_uninit_cdclk(struct drm_i915_private *dev_priv)
  	cdclk_state.vco = 0;
  	cdclk_state.voltage_level = bxt_calc_voltage_level(cdclk_state.cdclk);
- bxt_set_cdclk(dev_priv, &cdclk_state);
+	bxt_set_cdclk(dev_priv, &cdclk_state, INVALID_PIPE);
  }
static int cnl_calc_cdclk(int min_cdclk)
@@ -1664,7 +1671,8 @@ static void cnl_cdclk_pll_enable(struct drm_i915_private *dev_priv, int vco)
  }
static void cnl_set_cdclk(struct drm_i915_private *dev_priv,
-			  const struct intel_cdclk_state *cdclk_state)
+			  const struct intel_cdclk_state *cdclk_state,
+			  enum pipe pipe)
  {
  	int cdclk = cdclk_state->cdclk;
  	int vco = cdclk_state->vco;
@@ -1705,13 +1713,15 @@ static void cnl_set_cdclk(struct drm_i915_private *dev_priv,
  		cnl_cdclk_pll_enable(dev_priv, vco);
val = divider | skl_cdclk_decimal(cdclk);
-	/*
-	 * FIXME if only the cd2x divider needs changing, it could be done
-	 * without shutting off the pipe (if only one pipe is active).
-	 */
-	val |= BXT_CDCLK_CD2X_PIPE_NONE;
+	if (pipe == INVALID_PIPE)
+		val |= BXT_CDCLK_CD2X_PIPE_NONE;
+	else
+		val |= BXT_CDCLK_CD2X_PIPE(pipe);
  	I915_WRITE(CDCLK_CTL, val);
+ if (pipe != INVALID_PIPE)
+		intel_wait_for_vblank(dev_priv, pipe);
+
  	/* inform PCU of the change */
  	mutex_lock(&dev_priv->pcu_lock);
  	sandybridge_pcode_write(dev_priv, SKL_PCODE_CDCLK_CONTROL,
@@ -1848,7 +1858,8 @@ static int icl_calc_cdclk_pll_vco(struct drm_i915_private *dev_priv, int cdclk)
  }
static void icl_set_cdclk(struct drm_i915_private *dev_priv,
-			  const struct intel_cdclk_state *cdclk_state)
+			  const struct intel_cdclk_state *cdclk_state,
+			  enum pipe pipe)
  {
  	unsigned int cdclk = cdclk_state->cdclk;
  	unsigned int vco = cdclk_state->vco;
@@ -1873,6 +1884,11 @@ static void icl_set_cdclk(struct drm_i915_private *dev_priv,
  	if (dev_priv->cdclk.hw.vco != vco)
  		cnl_cdclk_pll_enable(dev_priv, vco);
+ /*
+	 * On ICL CD2X_DIV can only be 1, so we'll never end up changing the
+	 * divider here synchronized to a pipe while CDCLK is on, nor will we
+	 * need the corresponding vblank wait.
+	 */
  	I915_WRITE(CDCLK_CTL, ICL_CDCLK_CD2X_PIPE_NONE |
  			      skl_cdclk_decimal(cdclk));
@@ -2003,7 +2019,7 @@ void icl_init_cdclk(struct drm_i915_private *dev_priv)
  	sanitized_state.voltage_level =
  				icl_calc_voltage_level(sanitized_state.cdclk);
- icl_set_cdclk(dev_priv, &sanitized_state);
+	icl_set_cdclk(dev_priv, &sanitized_state, INVALID_PIPE);
  }
/**
@@ -2021,7 +2037,7 @@ void icl_uninit_cdclk(struct drm_i915_private *dev_priv)
  	cdclk_state.vco = 0;
  	cdclk_state.voltage_level = icl_calc_voltage_level(cdclk_state.cdclk);
- icl_set_cdclk(dev_priv, &cdclk_state);
+	icl_set_cdclk(dev_priv, &cdclk_state, INVALID_PIPE);
  }
/**
@@ -2049,7 +2065,7 @@ void cnl_init_cdclk(struct drm_i915_private *dev_priv)
  	cdclk_state.vco = cnl_cdclk_pll_vco(dev_priv, cdclk_state.cdclk);
  	cdclk_state.voltage_level = cnl_calc_voltage_level(cdclk_state.cdclk);
- cnl_set_cdclk(dev_priv, &cdclk_state);
+	cnl_set_cdclk(dev_priv, &cdclk_state, INVALID_PIPE);
  }
/**
@@ -2067,7 +2083,7 @@ void cnl_uninit_cdclk(struct drm_i915_private *dev_priv)
  	cdclk_state.vco = 0;
  	cdclk_state.voltage_level = cnl_calc_voltage_level(cdclk_state.cdclk);
- cnl_set_cdclk(dev_priv, &cdclk_state);
+	cnl_set_cdclk(dev_priv, &cdclk_state, INVALID_PIPE);
  }
/**
@@ -2087,6 +2103,27 @@ bool intel_cdclk_needs_modeset(const struct intel_cdclk_state *a,
  }
/**
+ * intel_cdclk_needs_cd2x_update - Determine if two CDCLK states require a cd2x divider update
+ * @a: first CDCLK state
+ * @b: second CDCLK state
+ *
+ * Returns:
+ * True if the CDCLK states require just a cd2x divider update, false if not.
+ */
+bool intel_cdclk_needs_cd2x_update(struct drm_i915_private *dev_priv,
+				   const struct intel_cdclk_state *a,
+				   const struct intel_cdclk_state *b)
+{
+	/* Older hw doesn't have the capability */
+	if (INTEL_GEN(dev_priv) < 10 && !IS_GEN9_LP(dev_priv))
+		return false;
+
+	return a->cdclk != b->cdclk &&
+		a->vco == b->vco &&
+		a->ref == b->ref;
+}
+
+/**
   * intel_cdclk_changed - Determine if two CDCLK states are different
   * @a: first CDCLK state
   * @b: second CDCLK state
@@ -2134,12 +2171,14 @@ void intel_dump_cdclk_state(const struct intel_cdclk_state *cdclk_state,
   * intel_set_cdclk - Push the CDCLK state to the hardware
   * @dev_priv: i915 device
   * @cdclk_state: new CDCLK state
+ * @pipe: pipe with which to synchronize the update
   *
   * Program the hardware based on the passed in CDCLK state,
   * if necessary.
   */
-void intel_set_cdclk(struct drm_i915_private *dev_priv,
-		     const struct intel_cdclk_state *cdclk_state)
+static void intel_set_cdclk(struct drm_i915_private *dev_priv,
+			    const struct intel_cdclk_state *cdclk_state,
+			    enum pipe pipe)
  {
  	if (!intel_cdclk_changed(&dev_priv->cdclk.hw, cdclk_state))
  		return;
@@ -2149,7 +2188,7 @@ void intel_set_cdclk(struct drm_i915_private *dev_priv,
intel_dump_cdclk_state(cdclk_state, "Changing CDCLK to"); - dev_priv->display.set_cdclk(dev_priv, cdclk_state);
+	dev_priv->display.set_cdclk(dev_priv, cdclk_state, pipe);
if (WARN(intel_cdclk_changed(&dev_priv->cdclk.hw, cdclk_state),
  		 "cdclk state doesn't match!\n")) {
@@ -2158,6 +2197,46 @@ void intel_set_cdclk(struct drm_i915_private *dev_priv,
  	}
  }
+/**
+ * intel_set_cdclk_pre_plane_update - Push the CDCLK state to the hardware
+ * @dev_priv: i915 device
+ * @old_state: old CDCLK state
+ * @new_state: new CDCLK state
+ * @pipe: pipe with which to synchronize the update
+ *
+ * Program the hardware before updating the HW plane state based on the passed
+ * in CDCLK state, if necessary.
+ */
+void
+intel_set_cdclk_pre_plane_update(struct drm_i915_private *dev_priv,
+				 const struct intel_cdclk_state *old_state,
+				 const struct intel_cdclk_state *new_state,
+				 enum pipe pipe)
+{
+	if (pipe == INVALID_PIPE || old_state->cdclk <= new_state->cdclk)
+		intel_set_cdclk(dev_priv, new_state, pipe);
+}
+
+/**
+ * intel_set_cdclk_post_plane_update - Push the CDCLK state to the hardware
+ * @dev_priv: i915 device
+ * @old_state: old CDCLK state
+ * @new_state: new CDCLK state
+ * @pipe: pipe with which to synchronize the update
+ *
+ * Program the hardware after updating the HW plane state based on the passed
+ * in CDCLK state, if necessary.
+ */
+void
+intel_set_cdclk_post_plane_update(struct drm_i915_private *dev_priv,
+				  const struct intel_cdclk_state *old_state,
+				  const struct intel_cdclk_state *new_state,
+				  enum pipe pipe)
+{
+	if (pipe != INVALID_PIPE && old_state->cdclk > new_state->cdclk)
+		intel_set_cdclk(dev_priv, new_state, pipe);
+}
+
  static int intel_pixel_rate_to_cdclk(struct drm_i915_private *dev_priv,
  				     int pixel_rate)
  {
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index f92bc1853595..6f4db68059cf 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -12999,6 +12999,7 @@ static int intel_modeset_checks(struct drm_atomic_state *state)
  	intel_state->active_crtcs = dev_priv->active_crtcs;
  	intel_state->cdclk.logical = dev_priv->cdclk.logical;
  	intel_state->cdclk.actual = dev_priv->cdclk.actual;
+	intel_state->cdclk.pipe = INVALID_PIPE;
for_each_oldnew_crtc_in_state(state, crtc, old_crtc_state, new_crtc_state, i) {
  		if (new_crtc_state->active)
@@ -13018,6 +13019,8 @@ static int intel_modeset_checks(struct drm_atomic_state *state)
  	 * adjusted_mode bits in the crtc directly.
  	 */
  	if (dev_priv->display.modeset_calc_cdclk) {
+		enum pipe pipe;
+
  		ret = dev_priv->display.modeset_calc_cdclk(state);
  		if (ret < 0)
  			return ret;
@@ -13034,12 +13037,36 @@ static int intel_modeset_checks(struct drm_atomic_state *state)
  				return ret;
  		}
+ if (is_power_of_2(intel_state->active_crtcs)) {
+			struct drm_crtc *crtc;
+			struct drm_crtc_state *crtc_state;
+
+			pipe = ilog2(intel_state->active_crtcs);
+			crtc = &intel_get_crtc_for_pipe(dev_priv, pipe)->base;
+			crtc_state = drm_atomic_get_new_crtc_state(state, crtc);
+			if (crtc_state && needs_modeset(crtc_state))
+				pipe = INVALID_PIPE;
+		} else {
+			pipe = INVALID_PIPE;
+		}
+
  		/* All pipes must be switched off while we change the cdclk. */
-		if (intel_cdclk_needs_modeset(&dev_priv->cdclk.actual,
-					      &intel_state->cdclk.actual)) {
+		if (pipe != INVALID_PIPE &&
+		    intel_cdclk_needs_cd2x_update(dev_priv,
+						  &dev_priv->cdclk.actual,
+						  &intel_state->cdclk.actual)) {
+			ret = intel_lock_all_pipes(state);
+			if (ret < 0)
+				return ret;
+
+			intel_state->cdclk.pipe = pipe;
+		} else if (intel_cdclk_needs_modeset(&dev_priv->cdclk.actual,
+						     &intel_state->cdclk.actual)) {
  			ret = intel_modeset_all_pipes(state);
  			if (ret < 0)
  				return ret;
+
+			intel_state->cdclk.pipe = INVALID_PIPE;
  		}
DRM_DEBUG_KMS("New cdclk calculated to be logical %u kHz, actual %u kHz\n",
@@ -13448,7 +13475,10 @@ static void intel_atomic_commit_tail(struct drm_atomic_state *state)
  	if (intel_state->modeset) {
  		drm_atomic_helper_update_legacy_modeset_state(state->dev, state);
- intel_set_cdclk(dev_priv, &dev_priv->cdclk.actual);
+		intel_set_cdclk_pre_plane_update(dev_priv,
+						 &intel_state->cdclk.actual,
+						 &dev_priv->cdclk.actual,
+						 intel_state->cdclk.pipe);
/*
  		 * SKL workaround: bspec recommends we disable the SAGV when we
@@ -13477,6 +13507,12 @@ static void intel_atomic_commit_tail(struct drm_atomic_state *state)
  	/* Now enable the clocks, plane, pipe, and connectors that we set up. */
  	dev_priv->display.update_crtcs(state);
+ if (intel_state->modeset)
+		intel_set_cdclk_post_plane_update(dev_priv,
+						  &intel_state->cdclk.actual,
+						  &dev_priv->cdclk.actual,
+						  intel_state->cdclk.pipe);
+
  	/* FIXME: We should call drm_atomic_helper_commit_hw_done() here
  	 * already, but still need the state for the delayed optimization. To
  	 * fix this:
diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index 23968df4e3ea..f8c988fe4516 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -559,6 +559,8 @@ struct intel_atomic_state {
int force_min_cdclk;
  		bool force_min_cdclk_changed;
+		/* pipe to which cd2x update is synchronized */
+		enum pipe pipe;
  	} cdclk;
bool dpll_set, modeset;
@@ -1694,13 +1696,24 @@ void intel_init_cdclk_hooks(struct drm_i915_private *dev_priv);
  void intel_update_max_cdclk(struct drm_i915_private *dev_priv);
  void intel_update_cdclk(struct drm_i915_private *dev_priv);
  void intel_update_rawclk(struct drm_i915_private *dev_priv);
+bool intel_cdclk_needs_cd2x_update(struct drm_i915_private *dev_priv,
+				   const struct intel_cdclk_state *a,
+				   const struct intel_cdclk_state *b);
  bool intel_cdclk_needs_modeset(const struct intel_cdclk_state *a,
  			       const struct intel_cdclk_state *b);
  bool intel_cdclk_changed(const struct intel_cdclk_state *a,
  			 const struct intel_cdclk_state *b);
  void intel_cdclk_swap_state(struct intel_atomic_state *state);
-void intel_set_cdclk(struct drm_i915_private *dev_priv,
-		     const struct intel_cdclk_state *cdclk_state);
+void
+intel_set_cdclk_pre_plane_update(struct drm_i915_private *dev_priv,
+				 const struct intel_cdclk_state *old_state,
+				 const struct intel_cdclk_state *new_state,
+				 enum pipe pipe);
+void
+intel_set_cdclk_post_plane_update(struct drm_i915_private *dev_priv,
+				  const struct intel_cdclk_state *old_state,
+				  const struct intel_cdclk_state *new_state,
+				  enum pipe pipe);
  void intel_dump_cdclk_state(const struct intel_cdclk_state *cdclk_state,
  			    const char *context);
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